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django - TypeError: post() 得到了一个意外的关键字参数

问题描述

我正在尝试创建一个可以直接与用户交流的简单博客。每个用户每个月都会有一篇由管理员发布的博客文章，他们可以对其发表评论进行交流。工作流程如下：

管理员登录到站点 -> 管理员会看到所有可用的用户。-> 管理员点击用户 -> 如果该用户有当月的帖子，则显示该帖子 -> 否则创建新帖子。

这是我所拥有的：

博客/urls.py：

from django.urls import path
from .views import MessageThread, CreateThread

urlpatterns = [
    path('user_thread/<int:user_id>', MessageThread.as_view(), name='message_thread'),
    path('create_thread/<int:user_id>', CreateThread.as_view(), name='create_thread'),
]

博客/models.py：

from django.db import models
from django.contrib.auth.models import User


class Post(models.Model):
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    title = models.CharField(max_length=200)
    text = models.TextField(max_length=9001)
    posted_for = models.ForeignKey(User, related_name='posted_for', on_delete=models.CASCADE)
    published_date = models.DateTimeField(blank=True, null=True)

    def __str__(self):
        return self.title

博客/forms.py：

from django.forms import models
from .models import Post


class CreateThreadForm(models.ModelForm):

    class Meta:
        model = Post
        fields = ['title', 'text']

博客/views.py：

from .forms import CreateThreadForm
from django.shortcuts import render, redirect
from django.views.generic import TemplateView
from datetime import datetime
from django.contrib.auth.models import User

class CreateThread(TemplateView):
    template_name = 'blog/create_thread.html'

    def get(self, request, *args, **kwargs):
        
        return render(request, self.template_name, {'form': CreateThreadForm(), 'user_id': self.kwargs['user_id']})

    def post(self, request):
        
        if 'comfirm_post' in request.POST:
            form = CreateThreadForm(request.POST)
            if form.is_valid():
                post_details = form.save(commit=False)
                post_details.author = request.user
                post_details.posted_for = User.objects.get(id=request.POST['user_id'])
                post_details.published_date = datetime.now()
                form.save()

                messages.success(request, "Successfully created post")
                return redirect('message_thread', user_id=request.POST['user_id'])

        messages.error(request, 'Something went wrong')
        return redirect('create_thread', user_id=request.POST['user_id'])

博客/create_thread.html：

{% extends 'navbar.html' %}
{% block content %}
    <h1>Create New Thread</h1>
    <form method="post">
        {% csrf_token %}
        {{ form.as_p }}
        <button type="submit" name="comfirm_post">Create Thread</button>
    </form>
{% endblock %}

问题是它甚至没有进入CreateThread类中的 post() 函数。它只是抛出一个错误说post() got an unexpected keyword argument 'user_id'。这是错误的完整引用：

Internal Server Error: /blog/create_thread/4
Traceback (most recent call last):
  File "C:\Projects\1-2-1\venv\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Projects\1-2-1\venv\lib\site-packages\django\core\handlers\base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:\Projects\1-2-1\venv\lib\site-packages\django\core\handlers\base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Projects\1-2-1\venv\lib\site-packages\django\views\generic\base.py", line 71, in view
    return self.dispatch(request, *args, **kwargs)
  File "C:\Projects\1-2-1\venv\lib\site-packages\django\views\generic\base.py", line 97, in dispatch
    return handler(request, *args, **kwargs)
TypeError: post() got an unexpected keyword argument 'user_id'
[27/Aug/2019 16:04:02] "POST /blog/create_thread/4 HTTP/1.1" 500 75548

我不知道它说的这个 user_id 来自哪里。我尝试将 user_id 作为隐藏输入从表单传递，我尝试更改操作以传递 user_id ，action={% url 'create_thread' user_id %}但这根​​本不起作用。

标签： djangodjango-modelsdjango-class-based-views

解决方案

你有user_id你的 URL 模式，

path('create_thread/<int:user_id>', ...

因此你的post方法应该采取user_id，你应该使用user_id而不是request.POST['user_id']：

def post(self, request, user_id):
    ...
    post_details.posted_for = User.objects.get(id=user_id)

或者，您可以接受*argsand **kwargs，并user_id从kwargsor获取self.kwargs。

def post(self, request, *args, **kwargs):
    ...
    post_details.posted_for = User.objects.get(id=self.kwargs['user_id'])

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